Ground Lesson 4; Transponder Operation; Exercise 4.1: Operating Modes And Code Entry - Garmin G1000 Manual

Objectives
Upon completion of this lesson, the pilot should be familiar and comfortable with the
operation of the integrated transponder controls located on the PFD of the GIFD System. This
includes the selection of the transponder operating mode, squawk code entry, and IDENT
activation.
Resources
• GIFD Pilot's Guide
• GIFD PC-based Simulator

Exercise 4.1: Operating Modes and Code Entry

1. To which transponder operating mode does the GIFD System default when it is first powered
up, if equipped with the Garmin Mode S Transponder (GTX 33)?
The Transponder begins operating in Ground mode, indicated by the letters 'GND' in the
Transponder Status Box.
2. Describe the process for entering a newly assigned transponder code.
1. On the PFD, press the XPDR Softkey
2. Press the CODE Softkey.
3. Use the appropriate digit softkeys to enter the assigned code. On certain airframes,
the transponder code can also be entered using the numeric keypad on an MFD/PFD
Control Unit (GCU).
3. Which Garmin LRU failure will cause the GIFD to lose Mode C/S capability?
If an Air Data Computer (GDC 74) fails, the GTX 33 Transponder will lose the pressure
altitude source, leaving it to operate in Mode A only.
4. Equipped with a GTX 33 Transponder, how is the GIFD able to receive traffic information?
Once the aircraft is airborne, the GTX 33 Transponder is able to receive traffic data and
display it graphically on the PFD/MFD maps. The aircraft must be within the coverage of
terminal Mode S radar sites to display TIS information.
5. What is acquisition squitter?
Acquisition squitter is transponder transmission that is sent periodically regardless of
the presence of interrogations. Its purpose is to make Mode S ground stations and Traffic
alert and Collision Avoidance System (TCAS)-equipped aircraft aware of the presence of
Mode S-equipped aircraft.
190-00368-05 Rev. B

Ground Lesson 4

TRANSPONDER OPERATION

GIFD Pilot's Training Guide 13